Answer:
Step-by-step explanation:
a. The topic sentence is: "Seoul, the capital of Korea, is old but modern, and populated."
b. The controlling idea is: The paragraph is discussing the city of Seoul, its ancient palaces that are major tourist attractions, and how it is also a modern city with a thriving and energetic population.
c. The paragraph begins with the topic sentence that introduces the main idea of the paragraph. The major support sentences that follow provide specific details about the ancient palaces in Seoul and the modern aspects of the city, including the high-rise buildings and transportation system. The minor support sentences add additional details and information, such as Seoul being the cultural and financial center of the country and its population being eager to make tourists' stays memorable.
d. A possible concluding sentence for the paragraph could be: "With its unique blend of ancient and modern attractions, Seoul is a city that never fails to impress its visitors."